Telegraph-key



(No Model.)

W. A. J. KOHRN. TELEGRAPH KEY.

No. 439,959. Patented Nov. 4, 1890.

WITNESSES.

INVENTOH fi lw %l/M z $5., 1 BY We/Q w A TTOHNEYS UNITED STATES PATENTOFFICE.

WILLIAM A. J. KOHRN, OF SAN FRANCISCO, CALIFORNIA.

TELEGRAPH-KEY.

SPECIFICATION forming part of Letters Patent No. 439,959, dated November4, 1890.

Application filed May 10, 1890. Serial No. 351,236. (No model.)

To all whom it may concern.-

Be it known that 1, WILLIAM A. J. KOHRN, of San Francisco, in the countyof San Francisco and State of California, have invented a new and usefulImprovement in Telegraph- Keys, of which the following is aspecification,

reference being had to the annexed drawings,

forming a part thereof, in which Figure 1 is a plan view of my improvedtelegraph-key. Fig. 2 is a plan view of the circuit-closing switch. Fig.3 is a side elevation, and Fig. 4 is a transverse section taken on lineon m in Fig. 2.

Similar letters of reference indicate corresponding parts in all theViews.

The object of my invention is to provide a telegraph-key in which thecircuit will be perfectly closed by the circuit-closing switch, and inwhich at the same time the contactpoints will be brought together, so asto prevent any accumulation of dirt upon the contact-surfaces. I

My invention consists in the combination, with the key, of acircuit-closing switch pivoted to the frame of the key and adapted toswing under the anvil-tongue in the usual way, and provided with abeveled arm arranged to engage a spring projecting downwardly from thekey-lever, so as to force the rear end of the key-lever upward,closingthe circuit at the contact-points of thekey as well as between thecircuit-closing switch and the anvil-tongue, all as will be hereinaftermore fully described.

The trunnions a of the key-lever A are pivoted in screws 1), passingthrough ears 0 on the frame B. To the front of the frame is attached theusual anvil 0, provided with the contact-point d and tongue 0. Thekey-lever A is furnished with a contact-pointy, arranged opposite thecontact-point d of the anvil C. To the under surface of the key-lever A,be-

tween the trunnions a and the rear end of the lever, is secured a fiatspring D, extending downwardly and rearwardly with its free end turnedup toward the keylever, as shown.

To the frame B, in the right-hand side thereof, is pivoted acircuit-closing lever E, provided with the curved finger g, whichextends rearwardly and is provided with the beveled or wedge-shaped endh, as shown in Figs. 3 and 4. The circuit-closing lever E is capable ofsliding under the tongue e, and its wedge-shaped end is adapted to slideunder the free end of the spring D, causing the keylever A to tilt andbring the point f into contact with the point d. It will thus be seenthat the circuit is closed through thccontactpoints of the key, and alsothrough the circuit-closing lever E. By means of this double device theclosing of the circuit is insured whenever the lever E is moved towardthe anvil 0.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. The combination, with a telegraph-key, of acircuit-closing lever pivoted to the keybase and provided with a curvedfinger adapted to force the contact-point of the keylever into contactwith the anvil-point, substantially as specified.

2. In a telegraph-key, the combination of the key-lever A, provided withthe contactpoint f, the spring D, attached to the key-lever, and thecircuit-closing lever E, adapted to slide under the anvil-tongue e, andprovided with the curved finger g for engaging the spring I),substantially as specified.

WILLIAM A. J. KOHRN.

Witnesses:

A. B. ST. JOHN, CHAS. C. DERMAN.

